HP XP P9500 Storage - Manual (Page 167)

4. From the primary host, register a command device for the forward direction for the storage
systems at the primary site and intermediate site.
5. From the primary host, establish an inter-disk controller logical path (Intermediate
→ Remote).
6. From the primary host, register a command device for the storage system in the forward
direction at the remote site.
Defining a 3DC Cascade (Cnt Ac-J Z x Cnt Ac-J Z) configuration 167